i dont know what this shit is.. but a good biulder when he ports your motor will be able to tell you what domes you need.. depending on if you wanna run race gas or pump gas.. if he dont get a diff biulder.. as for bolt on mods i would get a timing plate,lightend flywheel, and a noss head... then when you need more and decide on porting which is were you will get the most gains but still need the above.. then you can change domes and get diff carbs..